DNS Resolver(s) Tested:

  1. 18.232.1.38 (ec2-18-232-1-38.compute-1.amazonaws.com) appears to have GREAT source port randomness and GREAT transaction ID randomness.
  2. 35.170.83.174 (ec2-35-170-83-174.compute-1.amazonaws.com) appears to have GREAT source port randomness and GREAT transaction ID randomness.
  3. 35.170.83.163 (ec2-35-170-83-163.compute-1.amazonaws.com) appears to have GREAT source port randomness and GREAT transaction ID randomness.
  4. 3.238.209.19 (ec2-3-238-209-19.compute-1.amazonaws.com) appears to have GREAT source port randomness and GREAT transaction ID randomness.

Test time: 2021-10-21 15:22:04 UTC

Note that standard deviation is usually, but not always, a good indicator of randomness. Your brain is a better detector of randomness, so be sure to take a look at the scatter plots below. If you see patterns (such as straight lines), the values are probably less random than reported.


18.232.1.38 Source Port Randomness: GREAT

Number of samples: 30
Unique ports: 30
Range: 7579 - 63549
Modified Standard Deviation: 17471
Bits of Randomness: 16
Values Seen: 57046 11597 46995 36415 55389 55804 20408 7579 31444 50441 45739 55351 28655 23047 41733 13239 34080 43902 18980 26266 56973 62298 62203 33978 8539 42993 31194 35738 11870 63549

18.232.1.38 Transaction ID Randomness: GREAT

Number of samples: 30
Unique txids: 30
Range: 3138 - 63307
Modified Standard Deviation: 20322
Bits of Randomness: 16
Values Seen: 3138 57654 17524 62894 55051 12087 12793 58865 38171 6575 17800 15838 14784 19040 34854 33491 25737 48007 56583 43828 20294 9894 55742 11969 63307 13615 54812 63119 35576 50052

35.170.83.174 Source Port Randomness: GREAT

Number of samples: 6
Unique ports: 6
Range: 16273 - 63826
Modified Standard Deviation: 17258
Bits of Randomness: 16
Values Seen: 52318 16273 52761 63826 60602 55981

35.170.83.174 Transaction ID Randomness: GREAT

Number of samples: 6
Unique txids: 6
Range: 18079 - 58930
Modified Standard Deviation: 15823
Bits of Randomness: 16
Values Seen: 26089 18079 58930 46100 51591 47755

35.170.83.163 Source Port Randomness: GREAT

Number of samples: 56
Unique ports: 55
Range: 4901 - 65333
Modified Standard Deviation: 19360
Bits of Randomness: 16
Values Seen: 39997 53430 24679 64676 57645 23954 11372 31381 43125 64912 42825 4901 9766 6490 42428 41641 31622 60276 45384 63473 58120 16621 11026 31482 9856 57523 19503 60393 62396 56637 46709 6055 15320 5229 65010 32779 17966 58665 43030 50621 39985 54440 59455 49708 26676 58120 34271 11238 46915 35275 41074 16767 65333 7183 61161 41782

35.170.83.163 Transaction ID Randomness: GREAT

Number of samples: 56
Unique txids: 56
Range: 404 - 63601
Modified Standard Deviation: 19100
Bits of Randomness: 16
Values Seen: 6158 55269 21902 11861 50273 28190 18027 32154 24970 54993 21701 34379 11144 50639 53070 59607 4072 21617 9842 11831 45873 37448 37625 33781 51732 11625 24448 56813 18591 29295 32776 31092 16848 58741 6544 34281 47613 10637 404 28263 63601 39721 1954 15100 41058 63290 60693 8435 8131 59411 60382 26547 28955 1765 28661 50845

3.238.209.19 Source Port Randomness: GREAT

Number of samples: 6
Unique ports: 6
Range: 18423 - 60032
Modified Standard Deviation: 17521
Bits of Randomness: 16
Values Seen: 20760 43595 44955 56223 18423 60032

3.238.209.19 Transaction ID Randomness: GREAT

Number of samples: 6
Unique txids: 6
Range: 3163 - 49484
Modified Standard Deviation: 17371
Bits of Randomness: 16
Values Seen: 47102 41513 24632 49484 35774 3163

See CERT VU #800113 for information on the DNS cache poisoning vulnerability.

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